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This seems to be different, as in A1 it only happened to me when I right-clicked on an enemy and had the "reveal target" button still set to right mouse button from key configuration. This issue, however, happens just by looking around and not pressing anything (I have also disabled the key for reveal target so it could not be caused by that).

Here's an example. We start a co-op mission in which we have empty helicopters near me. I hear (and everyone else hears) immediately my soldier reporting "UNKNOWN HELICOPTER...". Then if I turn my head to the right where some vehicles have been placed, my soldier reports "UNKNOWN VEHICLE...", etc. Sometimes multiple reports after each other of different objects my soldier sees. These messages can be seen in text and heard in radio.

Someone told me in the Bohemia Interactive Forum that this is caused by something called "Auto report" which can be enabled and disabled from the game options difficulty settings. I personally have expert level selected and everything disabled. I also noticed that on expert level this "Auto report" can not even be enabled.

On a dedicated server, I believe the difficulty settings are set for everyone by the server's config and selected level in the mission selection screen. However, we have been playing the game on "Expert" level, which means that Auto report setting should automatically be disabled. If these radio/text reports that our human-controlled players are saying in our multiplayer sessions are really this "Auto report", then there must be some bug/error which causes these auto reports to be enabled even if the expert level has been selected.

Old ticket but what the heck... Having disabled autoreport on server, there is a great improvement in battle on what is being reported - pretty much nothing except those who reports via reveal functionality. The reports seems to be coming in just after mission join (and respawn?) and are afaik always of the "unknown" type.